Additional sleep parameters changed in three different SD protocols.
Additional sleep parameters from the control LD and corresponding experiment groups were illustrated with gray and black bars, respectively. (A) The effect of three SD protocols on maximum sleep episode duration during SD. (B) Mean sleep episode duration during SD. (C) The effect of DLS, DMS and DD on sleep frequency (number of sleep episodes in fix time). N numbers and statistical methods are the same as in Fig 1.